Math Bio Seminar - Dan Messenger

Dan Messenger, Department of Applied Mathematics, University of Colorado Boulder

Aggregation-Diffusion Phenomena in Domains with Boundaries

This talk relates to a class of mathematical models for the collective behaviour of autonomous agents, or particles, in general spatial domains, where particles exhibit pair-wise interactions and may be subject to environmental forces. Such models have been shown to exhibit non-trivial behaviour due to interactions with the boundary of the domain. More specifically, when there is a boundary, it has been observed that the swarm of particles readily evolves into unstable states. Given this behaviour, we investigate the regularizing effect of adding noise to the system in the form of Brownian motion at the particle level, which produces linear diffusion in the continuum limit. To investigate the effect of linear diffusion and interactions with the boundary on swarm equilibria, we analyze critical points of the associated energy functional, establishing conditions under which global minimizers exist. Through this process we uncover a new metastability phenomenon which necessitates the use of external forces to confine the swarm. We then introduce numerical methods for computing critical points of the energy, along with examples to motivate further research. Finally, we consider the short-time dynamics of the stochastic particle system as the noise strength approaches zero.

Tuesday, December 10, 2019 at 12:00pm to 1:00pm

Engineering Center, ECCR 257
1111 Engineering Drive, Boulder, CO 80309

Event Type

Colloquium/Seminar

Interests

Science & Technology, Research & Innovation

Audience

Faculty, Students, Postdoc, Graduate Students

College, School & Unit

Engineering & Applied Science

Tags

math bio seminar

Group
Applied Mathematics
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